diff options
Diffstat (limited to 'libavfilter/window_func.c')
-rw-r--r-- | libavfilter/window_func.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/libavfilter/window_func.c b/libavfilter/window_func.c index 15600beebb..9c6202aa18 100644 --- a/libavfilter/window_func.c +++ b/libavfilter/window_func.c @@ -104,6 +104,18 @@ void ff_generate_window_func(float *lut, int N, int win_func, float *overlap) lut[n] = exp(-0.5 * SQR((n-(N-1)/2)/(0.4*(N-1)/2.f))); *overlap = 0.75; break; + case WFUNC_TUKEY: + for (n = 0; n < N; n++) { + float M = (N-1)/2.; + + if (FFABS(n - M) >= 0.3 * M) { + lut[n] = 0.5 * (1 + cos((M_PI*(FFABS(n - M) - 0.3 * M))/((1 - 0.3) * M))); + } else { + lut[n] = 1; + } + } + *overlap = 0.33; + break; default: av_assert0(0); } |